I've signed up and have tried to get something useful out of facebook and the other major ones, but nothing productive has really come of any of it. I suppose if I were in college and it was the central repository for events or if I was looking for dates, maybe I would find something useful there. But college was a long time ago at this point and I'm married.

I hope they prove me wrong though. It would be nice if out of the blue I met someone interesting through one of these sites.